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    <a href="jisuan.html" target="_blank">计算器</a>
    <a href="for.html" target="_blank">for循环</a>
    <a href="if-else%20if-else.html" target="_blank">if语句</a>
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    <a href="hanshu.html" target="_blank">图片切换</a>
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    <a href="h1-h6.html" target="_blank">h1-h6</a>
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